and the first signs of the impending Romanian intervention in the war on the side of the Entente forced the command to reinforce the Third Army further during July and August with the 1st Cavalry division and the headquarters of the 6th Bdin Infantry Division together with one of its brigades. The defense of the Danube also became more important and in July a special German Danube Detachment of 3,019 men was formed up with Colonel von Kaufmann as its commander. This unit consisted of the German forces that were left in Varna and Shumen reinforced with the 6th Uhlan Regiment, the headquarters of the 7th Reserve Hussar Regiment with two squadrons, two mountain machine gun companies and a field battery from the 11th Army. In August the 115th Landwehr Regiment also arrived. The Campaign in Dobrudja Since the beginning of the First World War until the summer of 1916 the Central Powers had not considered any military response to a possible intervention of Romania on the side of the Allies and Austria-Hungary felt free to keep only small forces of soldiers and gendarmes in Transylvania. It was only in June 1916 that the headquarters of their high commands officially engaged in preliminary negotiations for combined military actions if the need arose. Then in July Field Marshal von Hötzendorf, General Falkenhayn and General Zhekov gathered at the German military headquarters in Pleß to finalize the talks and devise a general plan for the war. On 28 July they agreed on several measures – not to engage in unnecessary provocations against Romania, in case the country joined the Allies then Bulgaria was obliged to undertake offensive actions by all means and Austria-Hungary as far as the circumstances allowed. The Bulgarians were to advance in the Dobrudja capture the fortresses of Tutrakan and Silistra and then, with their right flank secured, prepare to cross the Danube and advance to Bucharest for which Austria-Hungary would commit its Danube Flotilla and bridge-building materials. Germany agreed to provide additional long range guns, airplanes and a zeppelin along with four or five infantry and one or two cavalry divisions for the front in Transylvania. In addition, von Falkenhayn was to reach an agreement with Enver Pasha on the deployment of Ottoman forces in Dobrudja. In early August Austria-Hungary began concentrating larger forces in Transylvania as part of its First Army but still by the time Romania